Kas teil on kogemusi BeanPostProcessor kirjutamisel?

BeanPostProcessor is an interface in Spring Framework that allows intercepting bean creation and modifying them before and after initialization. Experience in writing BeanPostProcessor is usually related to the need to introduce additional logic, such as wrapping beans in proxies, changing properties, or registering them in some services.

An example of a simple BeanPostProcessor that logs bean creation:

@Component
public class LoggingBeanPostProcessor implements BeanPostProcessor {
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) {
        System.out.println("Before init: " + beanName);
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) {
        System.out.println("After init: " + beanName);
        return bean;
    }
}

This approach is useful for cross-cutting tasks such as introducing aspects, validations, or custom initialization logic.